<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Test14</title>
</head>
<body>
    <script type="text/javascript">
        var a = parseInt(prompt("请输入你的成绩"));
        alert(a>=60?"及格":"不及格");
    </script>
</body>
</html>